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Bone: Mastoid antrum
Gray913.png
Coronal section of right temporal bone. ("Tympanic antrum" labeled at upper left.)
Gray914.png
The medial wall and part of the posterior and anterior walls of the right tympanic cavity, lateral view. ("Mastoid antrum" labeled at upper left, in dark circle.)
Latin antrum mastoideum
Gray's subject #230 1042

Mastoid antrum (or tympanic antrum) is a cavity in the petrous portion of the temporal bone, communicating posteriorly with the mastoid cells and anteriorly with the epitympanic recess of the middle ear via the aperture of the mastoid antrum.

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